Problems connecting through internet

Michael Ossmann michael.ossmann "at"
Fri, 18 Jan 2002 17:23:07 +0000

On Fri, Jan 18, 2002 at 08:35:06AM -0600, Hotel Puesta del Sol wrote:
> We are using the same Internet provider for both machines and verified with
> the ISP that they are not blocking any ports. Since we can reverse the setup
> (ie have the client become the server and the server become the client) this
> suggests that this is not an issue with the ISP. There is no firewall or
> security software running on the server machine and no other programs are
> trying to claim port 5900. A netstat -a reveals that port 5900 is unused
> before winvnc is running and that it is open and listening after winvnc is
> launched.

Very puzzling.  Perhaps you could ask your ISP to try the telnet test to
both sides from within their network.  If you are just taking their word
that they are not blocking anything, it might still be a good idea to
verify for yourself from a third location.  If you don't have a shell
account somewhere that you can use, feel free to send me the IP
addresses by private email and I'd be happy to test from here.  Have you
tried any other services (such as a web server)?  Are you able to ping
in both directions?  Are you using IP addresses or DNS names?  If DNS,
have you verified name service from both sides?

Mike Ossmann, Tarantella/UNIX Engineer/Instructor
Alternative Technology, Inc.
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